.header-wrapper {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
}
.nav-wrapper {
  position: fixed;
  left: 0;
  right: 0;
  top: 44px;
}

.mask {
  position: fixed;
  z-index: 1000;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
}
